Fermi surface and quasiparticle excitations of overdoped Tl2Ba2CuO6 + delta

The high-T(c) superconductor Tl(2)Ba(2)CuO(6 + delta) is studied by angle-resolved photoemission spectroscopy. For a very overdoped T(c) = 30 K sample, the Fermi surface consists of a single large hole pocket centered at (pi, pi) and is approaching a topological transition. Although a superconductin...

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Published inPhysical review letters Vol. 95; no. 7; p. 077001
Main Authors Platé, M, Mottershead, J D F, Elfimov, I S, Peets, D C, Liang, Ruixing, Bonn, D A, Hardy, W N, Chiuzbaian, S, Falub, M, Shi, M, Patthey, L, Damascelli, A
Format Journal Article
LanguageEnglish
Published United States 12.08.2005
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Summary:The high-T(c) superconductor Tl(2)Ba(2)CuO(6 + delta) is studied by angle-resolved photoemission spectroscopy. For a very overdoped T(c) = 30 K sample, the Fermi surface consists of a single large hole pocket centered at (pi, pi) and is approaching a topological transition. Although a superconducting gap with d(x(2)-y(2)) symmetry is tentatively identified, the quasiparticle evolution with momentum and binding energy exhibits a marked departure from the behavior observed in under and optimally doped cuprates. The relevance of these findings to scattering, many-body, and quantum-critical phenomena is discussed.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.95.077001